Are there any station building add-ons currently working? Like SSBB4.1? Or something similar. I always love launching a core mod into space then performing an eradanus rendezvous with smaller components. And using one or two of the ISS modules, like the service module.

I have been able to get most of the Shuttle payloads to work in a 2016 Atlantis. The big issue is the locations of attachments. I used attachment manager to adjust the attachment point. I had to add some new points also. The ones using Plyon I have been able to load/work